You need XD.
Lugia cannot be obtained as the event to get the item for it has finished.
Cheating
you can't.
at pal park or with action replay (cheats) but with trade I think that is better.
You cant catch lugia on diamond and pearl but at red or blue rescue team in the silver trench
Nope. Sorry. Unless you tradee.
yes
You can't, Lugia is not available in any way, shape or form in Pokémon Pearl. You can only get it through trading, migrating or cheating.
trade me alex a arceus
Lugia is not found in the wild in Pokemon Diamond. You must either trade from pal park, or trade with Heart Gold or Soul Silver.
The GameCube game "Pokemon XD: Gale of Darkness" has a "Shadow" Lugia that, once "purified", can be traded with a Ruby/Sapphire/Emerald cartridge.
You don't catch it. Trade it from XD: Gale of Darkness. It's a give-away, practically...The main shadow PKMN is Shadow lugia!